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37results about How to "Achieve white light emission" patented technology

Single-host white-light emitting fluorophosphate fluorescent powder for white-light LED and preparation method of fluorophosphate fluorescent powder

InactiveCN104726101AAchieve white light emissionOvercome the disadvantages of being difficult to controlEnergy efficient lightingLuminescent compositionsUltravioletGadolinium oxide
The invention discloses a single-host white-light emitting fluorophosphate fluorescent powder for a white-light LED and a preparation method of the fluorophosphate fluorescent powder. A chemical formula of the fluorescent powder is Ba3GdNa(PO4)3F:xEu<2+>, wherein x is 0.001-0.10; the preparation method comprises the following steps: weighing corresponding raw materials, namely barium carbonate, ammonium dihydrogen phosphate, gadolinium oxide, sodium fluoride and europium oxide according to the stoichiometric ratio of the chemical formula; grinding the raw materials evenly to obtain a mixture; sintering the mixture in a high-temperature furnace in a reducing atmosphere at 1250-1350 DEG C, and cooling to a room temperature to obtain the single-host white-light emitting fluorophosphate fluorescent powder. The obtained fluorescent powder can emit white light under excitation of an ultraviolet chip and purple light chip; two emission peaks exist and are respectively located at 470nm and 650nm; the fluorescent powder is good in dispersibility, uniform in granularity, good in chemical stability and high in luminous efficiency; an excitation band covers an ultraviolet region, a purple light region and a blue light region, and can be used as the single-host white-light emitting fluorescent powder for an ultraviolet LED and a purple light LED.
Owner:HANGZHOU DIANZI UNIV

Bifluorescence-emission organic light-emitting material and preparation method thereof

InactiveCN103409134AImprove solubilityEnhance electron pulling effectOrganic chemistryLuminescent compositionsBenzoic acidAryl
The invention discloses a bifluorescence-emission organic light-emitting material and a preparation method thereof. According to the bifluorescence-emission organic light-emitting material, three substitution aryl vinyl constitutional units are introduced to the 2-, 4- and 5- bits of an imidazole ring to form an imidazole organic light-emitting macromolecule comprising nitro and three-aryl vinyl. The preparation method of the bifluorescence-emission organic light-emitting material comprises the following steps: (1) synthesis of the intermediate: 4,4'-(3,4-dioxo-1,5-hexadiene-1,6-di-group) di-benzoic acid di-methyl ester; (2) synthesis of 4,4'-(2,2'-(2-(4-nitrobenzene vinyl)-1H-imidazole-4,5-di-group)) double(ethylene-2,1--di-group) di-benzoic acid di-methyl ester. The compound, disclosed by the invention, shows the bifluorescence emission characteristics in the tetrahydrofuran solution, the fluorescence spectrum of the compound nearly covers the entire visible region, and the compound emits strong yellow fluorescence. The preparation method is simple to operate, convenient to synthesize and easy to purify, has potential application value in the fields of fluorescence sensitivity and the like, and can be used for luminescent devices. The bifluorescence-emission organic light-emitting material and the preparation method expand the research field of three-aryl imidazole compounds.
Owner:TAISHAN UNIV

Single-substrate white-light fluorescent powder for white-light LEDs (light-emitting diodes) and preparation method thereof

The invention discloses a single-substrate white-light fluorescent powder for white-light LEDs (light-emitting diodes) and a preparation method thereof, belonging to the technical field of preparation of LED fluorescent powder. The composition expression of the white-light fluorescent powder is NaLaMgWO6:xTm<3+>,yDy<3+>,zEu<3+>, wherein x=0.07-0.2, y=0.01-0.07, and z=0.01-0.07. The preparation method comprises the following steps: 1) mixing Na2CO3, La2O3, Mg(NO3)2.6H2O, WO3, Tm2O3, Dy2O3 and Eu2O3 in a mole ratio of (0.5-2):(0.5-2):(0.5-2):1:x / 2:y / 2:z / 2, and grinding uniformly to obtain a powder mixture; and 2) carrying out solid-phase sintering on the powder mixture in a weakly reducing atmosphere to obtain the white-light fluorescent powder. The method is simple to operate, has the advantages of low facility request and environment friendliness, and is suitable for industrialized large-scale production.
Owner:SHAANXI UNIV OF SCI & TECH

White light-emitting aluminum nitride material injected with rare earth element as well as preparation method and application of white light-emitting aluminum nitride material

The invention relates to a white light-emitting aluminum nitride material injected with a rare earth element as well as a preparation method and an application of the white light-emitting aluminum nitride material. The preparation method comprises the steps of putting an aluminum nitride film material with the thickness of 50-100nm in an ion injecting device, and carrying out Pr, Er and Tm rare earth ion injecting and annealing treatments respectively, wherein the injecting energy range is 200-400KeV, the injecting angle is 0-10 degrees, the injecting doses of ions are equal and are 10<14>-10<16> per square centimeters respectively. The aluminum nitride material has the function of white light emission, can be used as a core function material and is applied to the fields of light-emitting diodes, panel display and the like.
Owner:SUZHOU UNIV OF SCI & TECH

Barcode-structure fluorescent ceramic for white LED devices and preparation method and application thereof

The invention discloses barcode-structure fluorescent ceramic for white LED devices. The barcode-structure fluorescent ceramic is composed of two or more ceramic units. The ceramic units emit light of different colors after being excited by the same LED lamp, and the light is synthesized into full-spectrum white light and then emitted out. The ceramic units are arranged alternately and closely in the horizontal plane to form an integrated structure similar to a barcode. After being excited by an LED chip arranged above or below the ceramic, the fluorescent ceramic of a barcode structure emits white light. The fluorescent ceramic has the characteristics of flexible spectrum adjustment, high light conversion efficiency and color rendering index, long service life, and good thermal stability. For a white LED device using the fluorescent ceramic, efficient utilization of energy is realized, and a small and compact lighting system is ensured. Therefore, the barcode-structure fluorescent ceramic can make up for the deficiency of the prior art and meet the requirement of market commercialization.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Organic porous polymer as well as preparation and application thereof

The invention discloses an organic porous polymer which is shown as the following general molecular formula and constructed by taking pyrene and 9,9-dioctylfluorene as monomers: (the general molecularformula is shown in the specification). The organic porous polymer can be used as an organic electroluminescence material for preparing a white light-emitting organic electroluminescence material bybeing doped with other micromolecular organic electroluminescence materials with complementary emitting colors. The doped other micromolecular organic electroluminescence materials can enter holes ofthe organic porous polymer, so as to keep the single-phase property of the polymer, avoid the phase separation and interface degradation phenomena caused by doping, and keep the emitting color stable.
Owner:TAIYUAN UNIV OF TECH

ESIPT luminescent material with delayed fluorescence property and preparation method and application thereof

The invention discloses an ESIPT luminescent material with a delayed fluorescence property and a preparation method and application thereof. Based on the special property of ESIPT, the luminescent material with the delayed fluorescence property and large Strokes shift is designed and synthesized. Meanwhile, the ESIPT luminescent material has the proper molecular energy level, high luminescent efficiency and a good film forming property, and can serve as a yellow light doping material for preparing a non-energy-transfer type luminescent thin film. In a finished organic electroluminescence device, the ESIPT luminescent material and a subject material do not suffer from energy transfer, proportional control over luminescent peaks of a subject and an object can be achieved by adjusting the doping proportion, and therefore repeatable multi-color luminescent OLEDs with the adjustable chroma are successfully prepared.
Owner:NANJING UNIV OF POSTS & TELECOMM

Green light luminescent material and preparation method thereof

The invention discloses a green light luminescent material which comprises the material with the following chemical formula: a CaO. B Al2O3, c SiO2: x Tb, wherein the a is larger than and equal to 0.4 and is less than and equal to 2.5, the b is larger than or equal to 0.2 and is less than or equal to 1.5, the c=1.0, and the x is larger than or equal to 0.001 and is less than or equal to 0.8. The green light luminescent material has high luminous efficiency, good stability and high luminous intensity, can be used in 'UV-LED+red, green and blue three-base color fluorescent powder', and replacesthe LED chip and is matched with the cerium-activated tombarthite garnet yellow fluorescent powder to send the white light. The preparation method of the green light luminescent material comprises the following steps of: adopting at least one oxide, carbonate and oxalate of Ca, Al2O3, SiO2 and Tb4O7 as raw materials, calcinating at high temperature under the reducing atmosphere, cooling to room temperature, and grinding to obtain the green light luminescent material. The preparation method of the green light luminescent material is simple in technology step, easy to control the technical conditions, easy to operate and low in cost.
Owner:OCEANS KING LIGHTING SCI&TECH CO LTD

Glass ceramic for up-conversion laser solid illumination, preparation method thereof and solid illuminating device

The invention discloses a glass ceramic for up-conversion laser solid illumination, a preparation method thereof and a solid illuminating device. The glass ceramic comprises the following components:50-78mol% of SiO2, 5-12mol% of Al2O3, 4-16mol% of Na2CO3, 15-30mol% of NaF, x mol% of YbF3, y mol% of YF3, z mol% of ErF3 and u mol% of TmF3, wherein x+y+z+u=8; x is more than or equal to 0.8 but lessthan or equal to 4.0; y is more than or equal to 4.5 but less than or equal to 6.6; z is more than or equal to 0 but less than or equal to 0.16; u is more than or equal to 0 but less than or equal to0.1; total molar weight of the components is 100mol%. The glass ceramic disclosed by the invention is prepared by adopting a fusion quenching method and subsequent thermal treatment; the acquired glass ceramic is capable of realizing up-conversion luminescence regulation of red, green and blue color (including white light) under the excitation of 980nm laser; a laser-driven solid illuminating device can be constructed by coupling the glass ceramic with 980nm laser.
Owner:FUJIAN NORMAL UNIV

Preparation method of phosphate luminescent material with adjustable luminescent color and luminescent material prepared by method

The invention discloses a preparation method of a beta-Ca3(PO4)2 type phosphate luminescent material with adjustable luminescent color and a luminescent material prepared by the method, and belongs tothe technical field of luminescent materials. The preparation method which adopts two steps of a sol-gel method comprises the following steps: preparing a CMNP precursor by a first step of the sol-gel method, and preparing Ca9EuNa(PO4)7 wet sol by a second step of the sol-gel method; and calcining Ca9MnNa(PO4)7 xerogel at low temperature to obtain the CMNP precursor, dispersing the CMNP precursorin the Ca9EuNa(PO4)7 wet sol to obtain a uniform mixture, then heating the uniform mixture to form mixed xerogel, and finally, calcining the mixed xerogel to obtain the phosphate luminescent material. From the aspect of synthesis, the luminescent property of the CMNP material is regulated and controlled by a two-step sol-gel synthesis strategy, and thus, regulation and control of the material from red light to yellow light to white light to green light are realized. The method is simple and easy to operate, and the obtained material has favorable properties.
Owner:SHANDONG UNIV

A kind of preparation method of boron nitride phosphor material

The invention relates to a preparation method of a nitride-boride fluorescent powder material. The preparation method is characterized in that common metal salt or oxide is used as the raw material, a high-temperature solid-phase method is used for preparation, the preparation process of nitride fluorescent powder is simplified, and production cost is lowered. The expression of the nitride-boride fluorescent powder material is AM4-4x(BN2):xD, wherein A is one or more of Li, Na, K, Rb and Cs; M is one or more of Mg, Ca, Sr and Ba, and D is one or more of Mn<2+>, Ce<3+>, Pr<3+>, Nd<3+>, Pm<3+>, Sm<3+>, Sm<2+>, Eu<3+>, Eu<2+>, Tb<3+>, Dy<3+>, Ho<3+>, Er<3+>, Tm<3+>, Yb<3+> and Yb<2+>. The preparation method specifically includes: weighing the raw materials of A, M and D and boric acid according to stoichiometric ratio, adding appropriate amount of acetone into the raw materials, and sufficiently grinding to obtain a mixture; performing heat preservation on the mixture for 1-5 hours in an environment of 400-650 DEG C and under reduction atmosphere; grinding and evenly mixing obtained preliminary-combustion substance, and performing heat preservation on the mixture for 1-8 hours in an environment of 700-900 DEG C to obtain the nitride-boride fluorescent powder material. The preparation method has the advantages that the method using a solid-phase synthesizing method is low in synthesizing temperature, simple in preparation process, low in cost, safe, reliable, short in production cycle and suitable for large-scale industrial production, and the prepared fluorescent powder is excellent in light-emitting efficiency.
Owner:HUZHOU TEACHERS COLLEGE

Rare earth-doped halide glass ceramics and preparation method thereof

The invention relates to rare earth-doped halide glass ceramics and a preparation method thereof. The glass ceramics are prepared through microcrystallization heat treatment, and the composition of the glass ceramics is: (100-x)(ZrF4-BaF2-YF3-AlF3)-xBaCl2:Re<3+>, wherein the value range of x is 0-33; Re<3+> is codoping of Pr<3+> and Ho<3+>, and the concentration proportional range of the Pr<3+> tothe Ho<3+> is 0.25-3. The glass ceramics involved in the invention have the characteristics of high fluorescence intensity and low cost, enhance the fluorescence intensity of the rare earth ions Pr<3+> and Ho<3+> under excitation of 445 nm blue light and X rays, and can be applied to the fields of white light emitting diode, scintillating materials and the like.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Barcode structure fluorescent ceramics for white light LED devices and its preparation method and application

The invention discloses barcode-structure fluorescent ceramic for white LED devices. The barcode-structure fluorescent ceramic is composed of two or more ceramic units. The ceramic units emit light of different colors after being excited by the same LED lamp, and the light is synthesized into full-spectrum white light and then emitted out. The ceramic units are arranged alternately and closely in the horizontal plane to form an integrated structure similar to a barcode. After being excited by an LED chip arranged above or below the ceramic, the fluorescent ceramic of a barcode structure emits white light. The fluorescent ceramic has the characteristics of flexible spectrum adjustment, high light conversion efficiency and color rendering index, long service life, and good thermal stability. For a white LED device using the fluorescent ceramic, efficient utilization of energy is realized, and a small and compact lighting system is ensured. Therefore, the barcode-structure fluorescent ceramic can make up for the deficiency of the prior art and meet the requirement of market commercialization.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Pyridine Anthracene Derivatives Platinum Coordination Compounds and Their Synthesis and Application

ActiveCN108070004BLower molecular tripletLowered tripletSolid-state devicesPlatinum organic compoundsChemical structureAnthracene
The invention discloses a pyridine-type anthracene derivative platinum coordination compound and its synthesis and application. The pyridine-type anthracene derivative platinum coordination compound is centered on the pyridine derivative platinum complex and anthracene group is added to reduce The triplet state of the entire molecule realizes near-infrared emission; and through the arrangement of the anthracene group on the molecule, the metal-to-ligand charge-transfer state and the metal-to-metal-to-ligand charge-transfer state are realized to achieve dual phosphorescent emission. The pyridine anthracene derivative platinum coordination compound can be used for temperature detection and as an electroluminescent material, and is a new temperature detection, single-molecule white light and near-infrared luminescent material. The present invention improves the key chemical structure and preparation process of the pyridine anthracene derivative platinum coordination compound, and obtains a new type of temperature detection, single-molecule white light and near-infrared based on the pyridine anthracene derivative platinum coordination compound. luminescent material, and the preparation method in the present invention is simple and feasible.
Owner:HUAZHONG UNIV OF SCI & TECH

A white light emitting aluminum nitride material injected with rare earth elements, preparation method and application

The invention relates to a white light-emitting aluminum nitride material injected with a rare earth element as well as a preparation method and an application of the white light-emitting aluminum nitride material. The preparation method comprises the steps of putting an aluminum nitride film material with the thickness of 50-100nm in an ion injecting device, and carrying out Pr, Er and Tm rare earth ion injecting and annealing treatments respectively, wherein the injecting energy range is 200-400KeV, the injecting angle is 0-10 degrees, the injecting doses of ions are equal and are 10<14>-10<16> per square centimeters respectively. The aluminum nitride material has the function of white light emission, can be used as a core function material and is applied to the fields of light-emitting diodes, panel display and the like.
Owner:SUZHOU UNIV OF SCI & TECH

Single-matrix white fluorescent powder for warm white LED (Light Emitting Diode) and preparation method thereof

The invention discloses a single-matrix white fluorescent powder for a warm white LED (Light Emitting Diode) and a preparation method thereof and belongs to the technical field of preparation of LED fluorescent powder. A composition expression formula of the white fluorescent powder is NaLaMgWO6:xTm<3+>, yTb<3+>, zSm<3+>, wherein x is equal to 0.05-0.25, y is equal to 0.01-0.1 and z is equal to 0.0025-0.05. The preparation method comprises the following steps: (1) respectively weighing Na2CO3, La2O3, Mg(NO3)2*6H2O, WO3, Tm2O3, Tb4O7 and Sm2O3 according to ratios; mixing and uniformly grinding to obtain mixed powder; and (2) carrying out solid-phase sintering on the mixed powder to obtain the single-matrix white fluorescent powder NaLaMgWO6:xTm<3+>, yTb<3+>, zSm<3+> for the warm white LED. The method is simple to operate, low in equipment requirements and environmental friendly, and is suitable for industrial large-scale production.
Owner:SHAANXI UNIV OF SCI & TECH

Dy < 3 + > doped white light fluorescent powder and preparation method thereof

ActiveCN112143498ARich in the visible spectrumLittle effect of temperatureEnergy efficient lightingLuminescent compositionsPhysicsRed light
The invention discloses Dy < 3 + > doped white light fluorescent powder and a preparation method thereof, the chemical general formula of the fluorescent powder is KY<1-x> (CO<3>)<2>: xDy<3+>, and 0<x< 0.3. When the content of Dy < 3 + > in KY<1-x> (CO<3>)<2>: xDy<3+> is 0, the substance KY (CO3) 2 does not emit light; when a luminescence center Dy < 3 + > is introduced into KY (CO3) 2, KY<1-x> (CO<3>)<2>: xDy<3+> emits white light under the irradiation of ultraviolet light; the effective excitation wavelengths of the white-light fluorescent powder are 325nm, 351nm, 365nm, 386nm and the like,and the optimal excitation wavelengths of the white-light fluorescent powder are 351nm and 368nm. When the fluorescent powder is excited, visible light components of blue light (peak wavelength 483 nm), yellow light (peak wavelength 578 nm) and red light (666 nm and 756 nm) exist in an emission spectrum of the fluorescent powder. Compared with white-light fluorescent powder with the synergistic effect of various light-emitting ions, Dy3 + ions in the matrix can absorb and emit photons at the same time, losses in the photon energy transfer process are reduced, and high energy utilization efficiency is achieved; the fluorescent powder is simple in preparation method and rich in spectral components, and can be widely applied to the fields of decoration, counterfeiting prevention, illumination and the like.
Owner:HUAIBEI NORMAL UNIVERSITY

White light electroluminescent device and preparation method and application thereof

The invention discloses a white light electroluminescent device and a preparation method and application thereof. The white light electroluminescent device comprises a laminated structure formed by a perovskite light-emitting unit, a middle layer and an organic light-emitting unit in sequence, spectrums of the perovskite light-emitting unit and the organic light-emitting unit are complementary, and the two light-emitting units jointly emit and are compounded to obtain white light. The preparation method of the white light electroluminescent device comprises the following steps: sequentially depositing each layer in a spin coating, spray coating, blade coating, thermal evaporation, printing or ink-jet printing manner to form a laminated structure, thereby obtaining the white light electroluminescent device. The white light electroluminescent device has the advantages of high efficiency, stable spectrum and the like, is low in manufacturing cost and simple in preparation process, and can completely meet the requirements of high-quality illumination and display.
Owner:SOUTH CHINA UNIV OF TECH

Novel solid yellow fluorescent powder

The invention discloses a novel solid yellow fluorescent powder. A preparation method comprises the following steps: adding 3 grams of analytic pure hexamethylenetetramine into 27 grams of distilled water for mixing, thereby preparing an aqueous solution, pouring the aqueous solution into a stainless steel reaction kettle with a polytetrafluoroethylene liner, adding 1 gram of polycarbonate powder, tightly covering the reaction kettle with a cover, placing the reaction kettle into a thermostat for heating, performing natural cooling after heating is completed, pouring into a flask, then obtaining yellow turbid liquid, and standing the yellow turbid liquid, thereby obtaining yellow precipitates; continuously adding the yellow precipitates into distilled water for filtering, removing soluble parts attached to the surface, and finally when the solution is clarified, drying the yellow precipitates, thereby obtaining yellow powder which is the solid yellow fluorescent powder. The prepared solid yellow fluorescent powder does not contain heavy metals, is easy and convenient to prepare and can realize white light emission under excitation of a blue light LED; the quantum yield is relatively high, and no pollution is caused.
Owner:LINYI UNIVERSITY

Pyridine anthracene derivative platinum coordination compound as well as synthesis and application thereof

The invention discloses a pyridine anthracene derivative platinum coordination compound as well as synthesis and an application thereof. The pyridine anthracene derivative platinum coordination compound takes a pyridine derivative platinum complex as the center, an anthracene group is added, and the triplet state of the whole molecule is reduced, so that near infrared emission is realized. Besides, the function of the MCLT (metal-to-ligand charge transfer) state and the dual function of MMLCT (metal-metal-to-ligand charge transfer) state are realized under the molecular arrangement effect of the anthracene group, and dual phosphorescence emission is realized. The pyridine anthracene derivative platinum coordination compound can be applied to temperature detection and used as an electroluminescent material and is a novel temperature detection, single-molecular white light and near infrared luminous material. Through improvement of key chemical structures and the preparation process of the pyridine anthracene derivative platinum coordination compound, the novel temperature detection, single-molecular white light and near infrared luminous material based on the pyridine anthracene derivative platinum coordination compound is obtained, and the preparation method is simple and feasible.
Owner:HUAZHONG UNIV OF SCI & TECH

Preparation method of nitride-boride fluorescent powder material

The invention relates to a preparation method of a nitride-boride fluorescent powder material. The preparation method is characterized in that common metal salt or oxide is used as the raw material, a high-temperature solid-phase method is used for preparation, the preparation process of nitride fluorescent powder is simplified, and production cost is lowered. The expression of the nitride-boride fluorescent powder material is AM4-4x(BN2):xD, wherein A is one or more of Li, Na, K, Rb and Cs; M is one or more of Mg, Ca, Sr and Ba, and D is one or more of Mn<2+>, Ce<3+>, Pr<3+>, Nd<3+>, Pm<3+>, Sm<3+>, Sm<2+>, Eu<3+>, Eu<2+>, Tb<3+>, Dy<3+>, Ho<3+>, Er<3+>, Tm<3+>, Yb<3+> and Yb<2+>. The preparation method specifically includes: weighing the raw materials of A, M and D and boric acid according to stoichiometric ratio, adding appropriate amount of acetone into the raw materials, and sufficiently grinding to obtain a mixture; performing heat preservation on the mixture for 1-5 hours in an environment of 400-650 DEG C and under reduction atmosphere; grinding and evenly mixing obtained preliminary-combustion substance, and performing heat preservation on the mixture for 1-8 hours in an environment of 700-900 DEG C to obtain the nitride-boride fluorescent powder material. The preparation method has the advantages that the method using a solid-phase synthesizing method is low in synthesizing temperature, simple in preparation process, low in cost, safe, reliable, short in production cycle and suitable for large-scale industrial production, and the prepared fluorescent powder is excellent in light-emitting efficiency.
Owner:HUZHOU TEACHERS COLLEGE

A quantum dot white light emitting diode

Disclosed in the invention is a quantum-dot white-light light-emitting diode comprising a substrate, an N-GaN layer, an active layer, a P-GaN layer, an N electrode, a P electrode and a transparent electric contact layer. The N-GaN layer, the active layer, the P-GaN layer, and the transparent electric contact layer are arranged on the substrate successively; the N-GaN layer and the P-GaN layer are connected with the N electrode and the P electrode. Conductive particles and red-light, yellow-light and green-light quantum dots are arranged in the transparent electric contact layer. According to the invention, the transparent electric contact layer having the conductive particles and red-light, yellow-light and green-light quantum dots is arranged on the P type layer, thereby forming the transparent electric contact layer generating multi-wavelength fluorescent light. After the transparent electric contact layer is stimulated by blue light emitted by a gallium-nitride-based light-emitting diode, white light emitting of a single chip is realized.
Owner:XIAMEN CHANGELIGHT CO LTD

Quantum-dot white-light light-emitting diode

Disclosed in the invention is a quantum-dot white-light light-emitting diode comprising a substrate, an N-GaN layer, an active layer, a P-GaN layer, an N electrode, a P electrode and a transparent electric contact layer. The N-GaN layer, the active layer, the P-GaN layer, and the transparent electric contact layer are arranged on the substrate successively; the N-GaN layer and the P-GaN layer are connected with the N electrode and the P electrode. Conductive particles and red-light, yellow-light and green-light quantum dots are arranged in the transparent electric contact layer. According to the invention, the transparent electric contact layer having the conductive particles and red-light, yellow-light and green-light quantum dots is arranged on the P type layer, thereby forming the transparent electric contact layer generating multi-wavelength fluorescent light. After the transparent electric contact layer is stimulated by blue light emitted by a gallium-nitride-based light-emitting diode, white light emitting of a single chip is realized.
Owner:XIAMEN CHANGELIGHT CO LTD

LED epitaxy structure based on gan hexagonal pyramid array and its preparation method

The invention relates to the field of a semiconductor, and discloses an LED epitaxial structure. The LED epitaxial structure comprises a substrate, a nucleating layer, a non-doped GaN layer, an n type GaN layer and a porous SiN<x> layer on the n type GaN layer, and also comprises an n type GaN hexagonal-pyramid array formed in the holes of the porous SiN<x> layer, and quantum dots on the peak of the hexagonal pyramid, quantum lines on the six ridges and a multi-quantum-well layer on six semi-polar (10-11) crystal surfaces, and a p type GaN filling layer at the tail part; and the GaN hexagonal pyramid and the quantum dots / lines / well layer at different positions thereon form the three-dimensional core-shell structure. The structure is large in light emitting area and high in light extracting efficiency; in addition, due to influences of different In contents and polarization effects and other factors, the light emitting wavelengths of the quantum dots / lines / well structures are also different; through reasonable control, white light emission can be realized; in the preparation method of the GaN hexagonal pyramid array, substrate patterning is not needed, so that the technological process is simple; and meanwhile, the grown GaN crystals are high in quality, so that the luminous efficiency of the LED can be improved effectively.
Owner:TAIYUAN UNIV OF TECH
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